fixed rubbing out `?` (help) after editing a Q-Register

* Test case: @EQa// @?/EX/ -- Rubout should return you to the Q-Register view.
* The test suite has been extended.
  Unfortunately we cannot currently directly check whether we're editing a Q-Register.
  But we add a magic number of characters to the Q-Register, that we can check afterwards.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/help.c b/src/help.c
index a093032..07acb86 100644
--- a/src/help.c
+++ b/src/help.c
@@ -289,13 +289,13 @@ teco_state_help_done(teco_machine_main_t *ctx, const teco_string_t *str, GError
 		return NULL;
 	}
 
-	teco_ring_undo_edit();
 	/*
 	 * ED hooks with the default lexer framework
 	 * will usually load the styling SciTECO script
 	 * when editing the buffer for the first time.
 	 */
-	if (!teco_ring_edit(topic->filename, error))
+	if (!teco_current_doc_undo_edit(error) ||
+	    !teco_ring_edit(topic->filename, error))
 		return NULL;
 
 	/*